Global Patent Index - EP 2028656 A1

EP 2028656 A1 2009-02-25 - OPTICAL RECORDING MEDIUM HAVING WRITE ONCE METAL REFLECTION FILM

Title (en)

OPTICAL RECORDING MEDIUM HAVING WRITE ONCE METAL REFLECTION FILM

Title (de)

OPTISCHES AUFZEICHNUNGSMEDIUM MIT METALLREFLEXIONSSCHICHT ZUM EINMALIGEN BESCHREIBEN

Title (fr)

SUPPORT D'ENREGISTREMENT OPTIQUE PRESENTANT UN FILM MÉTALLIQUE RÉFLÉCHISSANT À ECRITURE UNIQUE

Publication

EP 2028656 A1 (EN)

Application

EP 07745419 A

Priority

  • JP 2007062165 W
  • JP 2006166311 A

Abstract (en)

A pirated optical recording medium may be determined which is produced by physically transferring a shape of pits and lands formed on a substrate of an optical recording medium. The optical recording medium is provided with excellent weatherability and long-term storage reliability. A reflective film formed of an Ag alloy film of Ag 100-x-y X x Cu y , where X is at least one element among Ti, W, Ta, V, Mo, Nb and Zr, is formed on a substrate on which main data is recorded with a combination of pits and lands. A mark may be formed so that a reproduction signal level in the recorded mark of auxiliary data write once recorded on the reflective film is increased, and a reproduction signal level is decreased in an optical recording medium prepared by physically transferring the surface shape of the pits and lands of the substrate. A pirated optical recording medium may be determined in this manner.

IPC 8 full level (invention and additional information)

G11B 7/258 (2006.01); G11B 7/24 (2006.01)

CPC (invention and additional information)

G11B 7/259 (2013.01); G11B 7/00736 (2013.01); Y10T 428/21 (2013.01)

Designated contracting state (EPC)

AT DE FR GB

Designated extension state (EPC)

AL BA HR MK RS

DOCDB simple family

EP 2028656 A1 20090225; EP 2028656 A4 20101103; EP 2028656 B1 20111109; AT 533152 T 20111115; CN 101467210 A 20090624; CN 101467210 B 20110608; JP 2007335003 A 20071227; JP 4262730 B2 20090513; KR 100997913 B1 20101203; KR 20090005200 A 20090112; TW 200828282 A 20080701; TW I352344 B 20111111; US 2009252914 A1 20091008; US 8187689 B2 20120529; WO 2007145336 A1 20071221